Machine for casting tubular stereotype printing plates



March 5, 1929. w, D 1,703,977

MACHINE FOR CASTING TUBULAR STEREOTYPE PRINTING PLATES Original Filed April 19, 1921 4 Shgets-Sheet,

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MACHINE FOR CASTING QUBULAR STERBOTYPE PRINTING PLATES Original Filed April 19, 1921 4 s tw 2 E an 4.153s 7170 0 a: i WM Much 1929- H. A. w. wooo 1,703,977

MACHINE FQR CASTING TUBULAR S TEREOTYPE PRINTING PLATES Original Filed April 19, 1921 4 Shggts-Sheet enryAfH H're ooci t Manua s March 5, A, w woof I CHINE FOR CASTING TUBULAR STEREOTYPE PRINTING PLATES Original Filed Ap 9, 1921 4 Sheets-Sheet 4 Patented Mar. 5, 1929.

. UNITED STATES;

PATENT OFFICE HENRY A. WISE WOOD, OF NEW YORK, N. "55., ASSIGNOR T HOOD NEWSPAPER MA- CHINERY CORPORATION, OF NEW YORK, Y., A CORPORATION OF VIRGINIA.

MACHINE FOR CASTING TUBULAR STEREOTYPE PRINTING PLATES.

ori a application filed a i n 19, 1921, Serial No. 462,733. Divided and. this application filed December 13, 1924 Serial No. 755,767. Renewed July 5, i928.

This invention relates to a mold for pro.- ducing tubular stereotype printing plates,

namely, plates which constitute practically, a complete circle as distlngtmshed from theordinary semi-cylindrical plates. These plates substantially cover the entire cylinder of a press and are formed originally in their complete cylindrical condition. They are removed from the mold by turning the core which is provided with a helical groove forming a corresponding helical rib on the inside of the plate.

The principal objects of this invention are to provide improved means for operating the core for the purpose oi ejecting the casting; to provide for the casting of continuous ribs on the plate extending across the gap which to be provided, and means for automatically cuttingofi these ribs across the gap to provide simple and convenient means for holding the casting lOOX either in its vertical position for receiving or in its horizontal position for do livering; and to provide improvements in the mechanism for operating the core.

Further objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanyins drawings in which 1 is a plan, of a casting box constructed according to this invention;

Fig. 2 is a side view of the same in horizontal. position; 4

Fig. 3 is a side view of part oi? the box in horizontal position with the supporting shaft in section to illustrate the cam for ogerating the clutch for starting thecore;

Fig. {l is a sideview on an enlarged scale, and partly in central section, of the casting box in upright position ready for pouring; Fig. 5 1s a still iu'rther enlarged sectional view of the bottom of the mold cavity;

Fig. 6 isa sectionalview of the plate cast therein. showing the ribs across the gap;

Fig. 7 is a sectional view of the device for cutting oil the ribs;

Fig. 8 is a transverse sectional View of the casting box on the line 8-8 of Fig. 1 show the cooling chambers;

Fig. 9 is a view of the delivery end of the 0 cast ng b x;

Fig. 10 is a longit d na entra s tion f the lower end of the casting boxshowing the water circulating system; and

Fig. 11 is a transverse sectional view on the line 11--11 (it-Fig. 10; l i

The casting box 15 mounted on a frame 13 which is provided with two bearings for tr nnions leprojecting -from the sideso-f the box 15. The box is provided with long-item. nal pivots 16, andwitha cover 17 which is adapted to be opened for theinsertionoi' the matrix M. This cover is secured the botrotatably mounted therein and pro ided with a continuous helical groove 0 inits surface. The snal .matrixand head ringfl'l are provided and also the pouring: et' the outer end of the box. The st L1; the matrix are held in slits along sides of the margin bar B whiche ztends the across th mold cavity and throughout its length, f I

The-box being .closedand Lcondition for a t g i ca b turned from h ho iz nt l position shown in Figs. land Qinto the vertical positions shown in Fimlf casting position.

Fixedly mounted with respect to the frame 13 on each side is a cam 23l1aving two suri'accs on which a roller 21 is adapted to -rcst. This roller is i'iounted on a pivoted arm 22 and held against the cam by a spring 2'4". The cam 23 being sta tionary it will be understood that upon the rotationof the box from horizontal to vertical position the relation of the cam to the roller 21 will change from that shown infFig. 3 wherethe box is horizontal, to that shown in Fig. 4 where it is vertical.

ll is the Pivoted to the arm .22 is a link 24 and these the mold. The clutch ring is provided with a pair of longitudinal pins each extending through slots in a loose gear 36.

Tl e springs 27 normally force the clutch ring 31 and the pins 35 to the left in Fig. 10. The ends oi these pins bear on the flat surface of a circular plate 38 which is bolted to the end plate 39 of the mold proper and which in turn is bolted to the cap 30. On the end of this can is a hollow plate d0, the end of which is r l by a packing. These parts 38, 39, d0 and constitute a single element, therefore, containing a chamber and receiv ingg; some of the mechanism above described.

T to face of the plate 8 is provided with two deprt 'sions or no res 4-1 for receivii V the pins Obviously it the gear 36 is rotated when the arms 22 are swung over into the left hand position, that is, when the mold i horizontal, these pins 35 will spring into the notches dl'and take up the structure, 38, 39, 4L0 and 30 and rotate it. Furthermore, the plate 38 is keyed to the cylinder 33and therefore the core will rotate with it. The nold 15, however, is not a part of the rotary mechanism.

It may be stated at this point that the operating mechanism is driven by a sprocket chain 42 or any other desired device acting on a sprocket wheel l3 which is fixed to asprocket wheel l i, the two or which are freely rotatable on one or the trunnions 14. From the sprocket wheel lt a chain to drives a sprocket wheel 46 on the end of a shaft 4:7. On this shafts? there is a worm 48 messing ith the wormwheel 36 and driving it constantly. As these parts rotate around the trunnions 1% as a center this rotation can be kept .up at all'times ir" desired while the casting; is being; made, or it can be controlled to start it when desired. In either event the worm wheel rotates idly until the pins Miran-e in the notches ll. and then the core will be rotated.

The helical groove extends around vand along; the core and a continuous helical rib, therefore, is produced on the casting. The result of this rotation of the core, while the outside of the casting box is held stationary, is to force the casting in a rectilinear direction out of the end of the box. Although the margin bar B provides a longitudinal marginal opening throughout the length of the plate P, the helical grooves on the core are continuous and they cause connecting ribs R to be cast on the plate l projecting across the margin gap or opening. The ribs therefore are continuous. As the plate P is moved forward these ribs are cut of? by a knife 50 cured to the bracket 51 which is attached to the outside of the box and constitutes a support and bearing for the upper and outer end of the core.

In the casting of the plate, starting with the box in horizontal position, the hinged cover 1'? of the casting box is thrown open and the matrix placed in position against the head ring H. It is bent circumlerentially and its straight edges engage the margin bar B which extends throughout the length of the casting chamber. he pouring sheet is then put in place overlapping the circular end oi the matrix. The hinged cover 17 is closed and locked in position by the lever 18 and then the box is swung up into vertical 75 position. Metal then poured the box. Power is turned on in any desired way so that the chains 4:2 and -15 will be started. This rotates the wheel 36. li hcn the box has reached horizontal position the rollers 21 on the two sides 'lfallinto recesses on the cams 9.3. The sprin 27 swing the arm over to the left and bring; wi h them the clutch ring 31 which holes the pins 35 yielding y against the surface of the plate 38. As soon as the pins 35 come into registration with the notches {ll the springs 2? force these pins into the notches and thereatfterthe cap end of the mold and core C are rotated positively by the chains.

account oi the helical grooves in the core and the fact that the plate is held firmly by the margin bar E, the rotation oi the core will start the plate out of the box longitudinally with the matrix thereon. D11 0' motion of the plate forward the ribs u hrough the margin. opening; by the kn as stated.

This is a division of my application on a machine and plant for casting and cooling tubular stereotype printing plates, tiled April 19, 1921, Serial No. 462,733, patented January 6, 1924, No. 1,521,849, and I do not claim herein the matter claimed in that case.

Although I have described and illustrated only a single term of the invention 1 our aware of the fact that modi cations can he made therein by any person skilled in the art without departin from the scope of the invontion as expi sed in. the claims. Therefore, I do not wish to be lii'nited to all details of construction or the relative rungement of parts therein shown and scribed, but what I do claim is 1. In a. stereotype plate casting device, the 115 combination with a casting box mounted to swing from upright to horizontal position on a horizontal axis, of means for automatically ejecting the casting longitudinally from the box when it is turned down to horizontal position.

2. In a casting device, the combination of a box, a rotatable core therein having a. helical groove on its exterior surface for easting a corresponding rib on the interior of the plate, means for supporting said box on trunnions so that it can move from one position to another, and means for starting the core to rotate for ejecting the casting automati cally when the box is turned to one position.

lUll

the

said box on horizontal trunnions so that it can move from upright to delivering position means carried bv one of the trunnions for starting the core to rotate LOI'BJQCtlDg the plate when the box is turned to delivering position, said means comprising a. stationary cam on said trunnions, a-rms'having means for engaging said cam, springs for holding said means in contact With the cams, and means extendin from said arms for connecting the core with a source of power.

t. In a stereotype plate casting machine, the combination of a supporting frame, a cast ing box having horizontal trunnions carried by said frame on which the box is adapted to swing from vertical to horizontal 1308i". tion, astationary cam on one of the trunnions, and means controlled by said cam for starting to eject the plate when the box is turned to horizontal position.

5. in a stereotype plate casting device, the combination of a tubular box, a rotatable core therein having a helical groove on its exterior surface for casting a corresponding rib on the interior oi? the plate, means for support ing said box on horizontal trunnionsso that it can move from upright to delivering position, a. rotary Wheel, positive means for connecting said WllGGlWlllll the core to rotate the core, yielding means for actuating said positive means, and cams mounted on said trunnions in stationary position for preventing the action oi": said yielding means at all times until the mold is turned down to delivering position.

6. In a stereotype plate casting device, the combination of a box, arotatable core therein having a helical groove on its exterior surface for casting a corresponding rib on the interior of the plate, meanslfor supporting said box on horizontal t-runnions so that it can move from upright to horizontal position, a wheel treely rotatable 1n the mold box and positively driven, a. clutch ringl aving' pins projecting through said Wheel and fixedly connected with the core, a plate having notches for receiving the ends of sald pins,

yielding means for forcing said clutch ring inwardly to project the pins into the notches when they coine into registration, and positive means for holding the'clut-ch ring back except when the casting box is turned down to horizontal position and then permitting the yielding means to act.

7. In a stereotype plate (:2 sting device, the combinationot a tubular box, a rotatable core thereinhaving ahelical groove on its exterior surface for casting a corresponding rib on the interior oi the plate, a Wheel freely rotatable in the mold box and positively driven, a clutch ring having pins projecting through said Wheel and fixedly connected with the core, a plate having notches for receiving the ends of said pins, yielding means for forcing said clutch ring inwardly to project the pins into the notches When they come into registration, and positive means for holding the clutch ring back and then permitting the yielding means to act.

8. In a cast-mg box, the con' binatlon of a send-cylindrical box and a semi-cylindrical cover pivotedtogether to form a. complete cylindrical mold cavity, of a cylindrical core therein having a continuous helical groove on its surface extending from end to end and a longitudinal matrix barcontacting with the cylindrical surface of the core and under which said grooves extend, and means for ejecting the casting from the box Without raising said cover.

In testimony Wliereof l have hereunto atiixed my signature.

" ENRY A. Wish WOOD. 

